一I heard that you got an A in the chemistry exam．Well done!
一Thanks，I know that you a good job as well．A.shouId have doneB.need have doneC.must have doneD.could have done
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C解析考查情态动词用法。A本应该做某事实际上去没有做；B本需要做实际上却未做；C一定做了某事；D本可以做却未做。句意—我听说在化学考试中你得了A。做得好。—谢谢。我知道你也一定做的很好。